AnswersRVACR EcologyCharacteristics of Life

Characteristics of Life — Cumulative exam Answers

0 verified answers1 views
1
Free Preview

Which recent discovery led to a new understanding of how genetic mutations increase the risk of cancer?

A
double helix structure of DNA
B
BRCA1 and BRCA2 genes
C
nucleic acid monomers
D
formation of tumor suppressor proteins
2
Free Preview

Which food contains mostly polysaccharides?

A
cake
B
sugar
C
berries
D
pasta
3

A dietician examines the diet of a patient who is complaining that he is unable to build muscle mass. The patient eats mainly fresh fruits, vegetables, pasta, bread, and some fats and oils. Which type of supplement will the dietician most likely recommend?

A
citric acid
B
fatty acids
C
nucleic acids
D
amino acids
4

What do all cellular activities in living organisms use as a source of energy?

A
ATP
B
lactic acid
C
pyruvic acid
D
carbon dioxide
5

What prohibits lipids from being a readily available energy source?

A
Fat must be broken down into fatty acids before being converted to glucose.
B
Lipids are structural components, so they are a last-resort energy source.
C
Lipids are only used to create enzymes, hormones, and antibodies.
D
The conversion of fat to glucose is controlled by insulin.
6

Consider the plant cells in the image below.Which is a function of the cell structure that is labeled X?

Question illustration
A
It stores lipids.
B
It helps in cell metabolism.
C
It provides support.
D
It transports proteins.
7

Two cells in the same organism differ only in the number of chloroplasts they contain. The first cell has multiple chloroplasts, and the second cell has very few. What would most likely characterize these cells?

A
There would be no difference between the functioning of the cells because the chloroplasts are not essential cell structures.
B
The second cell would become larger because it would have fewer chloroplasts regulating its size and shape.
C
The second cell would shrink because it would not be able to store water and maintain cell shape.
D
The second cell would not be able to produce as much food because it could not capture very much sunlight.
8

Which statement best describes the process of chemiosmosis and the direct result of its occurrence?

A
Hydrogen ions flow from the thylakoid down a concentration gradient through ATP synthase channels into the stroma. ADP is converted to ATP.
B
Hydrogen ions flow from the thylakoid down a concentration gradient through ATP synthase channels into the stroma. ATP is converted to ADP.
C
Hydrogen ions flow from the stroma down a concentration gradient through ATP synthase channels into the thylakoid. ADP is converted to ATP.
D
Hydrogen ions flow from the thylakoid against a concentration gradient through ATP synthase channels into the stroma. ADP is converted to ATP.
9

What scientific knowledge about macromolecules is a direct result of Gerardus Johnannes Mulder’s 1838 discovery?

A
All proteins contain carbon, hydrogen, oxygen, and nitrogen.
B
All carbohydrates contain carbon, hydrogen, and oxygen.
C
Nucleic acids are polymers with nucleotide monomers.
D
The helical structure of DNA is essential for protein production.
10

Lactose (milk sugar) is a carbohydrate that is formed by combining galactose and glucose. Which term best describes this molecule?

A
monosaccharide
B
disaccharide
C
monomer
D
starch
11

According to the endosymbiotic theory, which cellular process was involved in the evolution of mitochondria and chloroplasts?

A
symbiosis
B
phagocytosis
C
endosymbiosis
D
photosynthesis
12

Which statement best describes the overall change that occurs as a result of mitosis?

A
One cell becomes two cells that have identical copies of DNA.
B
One cell becomes two cells that have different copies of DNA.
C
Two cells become two cells that have identical copies of DNA.
D
Two cells become two cells that have different copies of DNA.
13

Shannon is making a Venn diagram to organize the characteristics of cell walls and cell membranes. Which pair of characteristics both belong in the two areas of the Venn diagram that do not intersect?

A
helps with communication; contains mostly cellulose
B
contains mostly cellulose; forms the outer layer of animal cells
C
is found in plant cells; is found in animal cells
D
is semipermeable; found in animal cells
14

What would most likely happen to plants if they did not have a waxy outer coating?

A
They would store more water in their leaves.
B
They would photosynthesize at a faster rate.
C
They would store more sugars in their leaves.
D
They would be harmed by insects and UV radiation.
15

What type of lipid is estrogen?

A
steroid
B
phospholipid
C
triglyceride
D
wax
16

Which level of organization is characterized by a group of cells that work together to perform a common function?

A
organ
B
tissue
C
organ system
D
organism
17

What is the maximum magnification of most classroom compound light microscopes?

A
100x
B
500x
C
1,000x
D
5,000x
18

Which question can be answered by following the scientific method?

A
What was the highest temperature that was recorded yesterday?
B
What is the most interesting aspect of the light-dependent reactions?
C
How does a change in temperature affect the stomata of a plant?
D
How many stomata are there on this leaf?
19

What is carbon fixation, and how does it relate to photosynthesis?

A
It is the absorption of CO2 from the air, and it occurs during the light-dependent reactions.
B
It is the reduction of CO2, and it occurs during the Calvin cycle.
C
It is the conversion of CO2 into organic compounds, and it forms 3-PGA.
D
It is the production of CO2 during regeneration, and it forms RuBP.
20

The chemical equation below summarizes the process of photosynthesis.6CO2 + 6H2O + energy à 6O2 + C6H12O6Where is the energy shown in the equation transferred as a result of photosynthesis?

A
into water
B
into the air
C
into sugars
D
into the ground

Did you find these answers helpful?

More from this Course

Quiz
11 verified answers

Animal and Plant Cells

Quiz
10 verified answers

Characteristics of Life

Quiz
10 verified answers

Macromolecules