AnswersLA-Biology B-CRCumulative Exam

Cumulative Exam — Cumulative exam Answers

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21
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Which is a requirement for natural selection to occur?

A
heritable variations for some traits
B
the ability of an organism to improve a trait during its lifetime
C
equal probability of survival for all offspring
D
fewer offspring than the environment can support
22
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Sophie says dolphins and sharks look very similar, so they must be related. Jake disagrees, saying DNA evidence has shown that dolphins and other aquatic mammals are actually more closely related to the ancestors of modern hippos. Who is correct using the modern system of classification?

A
Sophie is correct because dolphins look more like sharks than like hippos.
B
Jake is correct because classification is based on evolutionary relationships.
C
Both are correct because traditional and modern classifications can overlap.
D
Neither is correct because neither is taking into account both the traditional and modern systems
23

Consider the phylogenetic tree.Which pair of organisms is most closely related to primates?

Question illustration
A
amphibians and rodents
B
crocodiles and amphibians
C
rodents and rabbits
D
dinosaurs and birds
24

Plant reproduction requires the presence of auxins, as well as a large amount of sugar for energy. Which two main plant tissues work together to release sugar and carry hormones so that reproduction can take place?

A
leaves and dermal
B
stems and ground
C
dermal and vascular
D
ground and vascular
25

Which best describes lymph?

A
Lymph is a clear liquid that flows in arteries.
B
Lymph helps protect the body from pathogens.
C
Lymph contains only protein and white blood cells.
D
Lymph allows for the transport of oxygen throughout the body.
26

Fossils most often form when a dead organism is buried in sediments.

A
T
B
F
27

Rock layers can be correlated to eachother using fossils. Please select the best answer from the choices provided

A
T
B
F
28

Based on the chart below, if a patient can receive only blood types O–, O+, B–, and B+, which blood type does she have?

Question illustration
A
B+
B
B–
C
O+
D
AB+
29

Ralph is looking at a blood vessel under a microscope as part of his study about the cardiovascular system. He notices that the vessel contains blood and has valves. What is the blood vessel that he is observing?

A
capillary
B
vein
C
lymph
D
artery
30

Which of these can be found in both gymnosperms and angiosperms?

A
vascular tissue and exposed seeds
B
vascular tissue and seeds
C
flowers and vascular tissue
D
enclosed seeds and flowers
31

What do the skin and urinary system have in common?

A
Both remove filtered wastes and reabsorb blood.
B
Both remove undigested food from the body.
C
Both remove urine from the body.
D
Both remove urea from the body.
32

This diagram illustrates the three types of plant tissue.Which main plant tissue are the lines pointing to in the enlarged diagram?

Question illustration
A
dermal
B
ground
C
vascular
D
meristem
33

The kidneys and sweat glands both work to prevent excesses of

A
either uric acid or urine in the body.
B
either water or salt in the body.
C
either carbon dioxide or oxygen in the body.
D
either feces or pH levels in the body.
34

How does the structure of the small intestine help it to perform its function?

A
Compartments in the small intestine hold bile from the liver to make the absorption of nutrients more efficient.
B
Involuntary muscles of the small intestine contract to make the absorption of nutrients more efficient.
C
Glands in the small intestine hold saliva to make the absorption of nutrients more efficient.
D
Villi in the small intestine have thin-walled capillaries to make the absorption of nutrients more efficient.
35

A dichotomous key uses

A
inferences.
B
DNA sequences.
C
subjective descriptions.
D
observable characteristics.
36

Which of the following statements best describes scientific research?

A
Research typically uses one source.
B
Research typically uses a variety of sources.
C
Research is all done by doctors.
D
Research is all done in a laboratory.
37

Consider this microscopic image of bacteria. Which bacterial form is shown in the image?

Question illustration
A
bacillus
B
nucleoid
C
spirillum
D
coccus
38

Fossils show how the complexity of living organisms has changed over time. Gerobatrachus hottoni was a unique organism that lived during the Permian period between ancient salamanders and ancient frogs. Scientists have nicknamed this organism the “frogamander” because it is believed to be a common ancestor of both modern frogs and salamanders.Which type of fossil is Gerobatrachus hottoni most likely to be?

Question illustration
A
intermediary
B
phylogenic
C
transitional
D
index
39

The amount of time it takes for an amount of a specific isotope to decay to half the original amount. a.absolute-life c.half-lifeb.relative-lifed.specific-life

A
A
B
B
C
C
D
D
40

Which form of natural selection does the graph represent?

Question illustration
A
directional selection
B
disruptive selection
C
sexual selection
D
stabilizing selection

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