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1. During mitosis, the genetic material in a cell is replicated, and then the cell splits into two new cells. The two new cells are genetically identical to the original cell.

Which part of cell theory do these statements best support?
A.
All organisms are made up of many different types of cells.
B.
Both living and nonliving substances are made of cells.
C.
All cells come from pre-existing cells.
D.
New cells can be spontaneously generated.

Question 2 .
A _______ is a segment of DNA that contains the information necessary to express the inherited traits of an organism.
A.
gene
B.
phenotype
C.
protein
D.
sex cell

Question 3 .
Eva learns in class that the amount of light given off by an object obeys the inverse square law: that the intensity of light is proportional the inverse of the square of the distance.


where S is a constant and d is the distance.

Eva measures the intensity of light versus distance in class and makes a graph of her results. Which of the following graphs would best support the inverse square law?

W.
X.

Y.
Z.
A.
Y
B.
W
C.
Z
D.
X

Question 4 .
Green plants get their food through
A.
digestion.
B.
photosynthesis.
C.
respiration.
D.
osmosis.

Question 5 .
If snakes were removed from the food web, what would probably happen to the grasshopper population?
A.
The population of frogs and mice would decrease which would cause the population of grasshoppers to increase.
B.
The population of frogs and mice would decrease which would cause the population of grasshoppers to decrease.
C.
The population of frogs and mice would increase which would cause the population of grasshoppers to increase.
D.
The population of frogs and mice would increase which would cause the population of grasshoppers to decrease.

Question 6 .
Mary has two blocks. She wants to compare the mass and volume of both, so she places them in identical buckets filled with the same volume of water. Each block sinks slowly, and the picture below shows them as they are about to sink. She measures the change in water level with rulers.


Mary's friend observes the investigation and claims that block B has more mass. If there were no errors in the investigation, which of the following must be TRUE for this claim to be correct?
A.
Block B must be longer than block A.
B.
Block B must have more volume than block A.
C.
Block B must be larger than block A.
D.
Block B must have greater density than block A.

Question 7 .
Mandy is testing an unknown solution to determine whether it is an acid or a base. She places a piece of red litmus paper into the solution and the paper turns blue.

Mandy's unknown solution
A.
does not have a pH.
B.
is a base.
C.
is an acid.
D.
is a neutral substance.

Question 8 .
Glucose molecules from food sources provide energy to the cells of the human body. After a person eats, the level of glucose in their blood increases.

If a person's blood glucose level becomes too high, a hormone in the pancreas, known as insulin, is released. Insulin helps move glucose out of the bloodstream. This causes the blood glucose level to decrease and return to equilibrium.

The production of insulin is a mechanism that regulates the human body's internal environment and aids in
A.
the storage of genetic information within cells.
B.
the production of sugar molecules through photosynthesis.
C.
the production of carbon dioxide through cellular respiration.
D.
the maintenance of homeostasis within the body system.

Question 9 .
Chemical compounds
A.
can be made up of a combination of different elements.

B.
are always made up of one type of element and one type of atom.

C.
are always made up of several atoms with the same number of protons.

D.
can be made up of one atom with several different elements in it.

Question 10 .
The First Five Planets from the Sun

Planet Mean
Distance
from Sun
(millions
of km) Orbital
Period of
Revolution
(Earth time) Period of
Rotation
(Earth time) Equatorial
Diameter
(km) Density
(g/cm3)
Mercury 57.9 88 days 59 days 4,880 5.4
Venus 108.2 224.7 days 243 days 12,104 5.2
Earth 149.6 365.3 days 23 hours
56 minutes 12,756 5.5
Mars 227.9 687 days 24 hours
37 minutes 6,787 3.9
Jupiter 778.3 11.86 years 9 hours
50 minutes 142,800 1.3
Which of these planets has the shortest day?
A.
Venus
B.
Jupiter
C.
Mars
D.
Mercury

Respuesta :

wiseowl2018

Answer:

Part 1.

The correct option is the option C which is all cells come from the pre-existing cells.

Explanation:

Mitosis is the cell division in which one cell divides into two identical cells having same number of chromosomes.

So a cell divide into two giving two cells which further divides.

Even a whole organism come from the division of single cell which is made from the combination of an egg and sperm.

Part 2.

The correct option is the option A which is gene.

Explanation:

DNA contains all the information necessary for a whole organism.

A gene is the unit of DNA which describes a single trait.

For example gene of eye color and gene for insulin production.

So the gene is exact answer to this question while proteins and phenotype are less relevant to question.

Part 3.

Graphs are not given in this question but a graph Will be hyperbola type of inversely proportional. The line in graph descends.

Explanation:

If distance square is on x axis and intensity of light on y axis, The line will move from upward to lower direction.

In the graph at initial distance means low square of distance the intensity will be high and as the square distance increases the intensity will become low.

The line on the graph will descends as the distance square on x axis increases.

Part 4.

The correct answer will be option B.

Explanation:

  • The process of generating sugar from the carbon dioxide and water in the presence of light and green pigment chlorophyll is known as the photosynthesis.
  • It occurs mostly in leaves off plants.
  • While respiration is the breakdown of food generating energy.
  • And digestion is simplification of complex molecules and osmosis is the transport of water across membrane.
  • Hence photosynthesis is the correct answer.

Part 5.

The correct answer is the option D which is the population of frogs and mice would increase which would cause the population of grasshoppers to decrease.

Explanation:

Snake is the tertiary consumer in a food web and frogs and mice are secondary consumer while grasshopper is the primary consumer.

As the snake is removed from the food web the population of frogs and mice will increase due to the less pray of secondary consumers.

As frog and mice will increased they will eat more grasshopper making decrease in grasshopper population.

Part 6.

The correct answer is the option B which is the volume of block B is more than A.

Explanation:

The rate of sinking depends upon the density of blocks.

As we know both blocks sink at the same rate. Hence both blocks have same density.

Now the mass measured of block B is more than block A.

But their mass to volume ratio is same. So it means block B has more mass with more volume making density equal to block A.

Part 7.

The correct answer is the option B which is the solution is the base.

Explanation:

  • Litmus papers are indicators that are used to know the pH of a solution.
  • They change color as the indication of acidic or basic solution.
  • A red litmus paper turns into blue when the solution is basic.
  • A blue litmus paper turns red under acidic solution.

In this question the red litmus changes color to blue it means solution would be basic or alkaline.

Part 8.

The correct answer of this question is the option D which is insulin maintain the homeostasis within the body system.

Explanation:

Homeostasis is body's condition in internal equilibrium. It actually maintains the body in internal condition into dynamic equilibrium.

As the concentration of glucose increases the insulin lowers it. And as the glucose level concentration becomes too low then an hormone known as glycogen is release by pancreas which increases the glucose level in blood.

Hence all mechanism of insulin is to maintain the homeostasis in body.

Part 9.

The correct option is A.

Explanation:

  • A chemical compound is the combination of two or more than two different elements forming a stable compound.
  • While an element is the combination of 2 or more than 2 same atoms.
  • Atoms form elements and elements forms the compounds.
  • For example C6H12O6 is a chemical compound made from 3 types of elements.
  • While H2 is an elements.

Part 10.

The option B is the correct option. Jupiter has shortest day in given planets.

Explanation:

  • The time period of a day of a planet depends upon its rotation around its axis.
  • A planet with shortest time period of rotation around its axis will have shortest day.
  • The Jupiter has shortest day. Its spinning time around its axis is  9 hr 55 min 29.69 sec.
  • It is because Jupiter has small axial tilt of only 3.13 degrees.





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