AnswersSnider - Biology Living Earth B Summer 2026Unit Test

Unit Test — Cumulative exam Answers

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Pea plants can have yellow seeds or green seeds. Which conclusion about the meaning of Y is correct if the allele combination Yy is for yellow seeds?

A
yellow and dominant
B
green and recessive
C
yellow and recessive
D
green and dominant
2
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Mitosis is divided into phases.Which phase of mitosis is shown in the diagram?

Question illustration
A
anaphase
B
metaphase
C
telophase
D
prophase
3

Which best contrasts self-renewal and differentiation?

A
Only differentiation is a process that results from stem cell division.
B
Only differentiation creates more of the same types of cells.
C
Only self-renewal creates more of the same types of cells.
D
Only self-renewal depends on gene expression.
4

If the endoplasmic reticulum were removed from the cell, which organelle would not be able to function properly, and why?

A
mitochondria, because they rely on the ER as an energy source
B
ribosomes, because they receive proteins made by the ER
C
Golgi apparatus, because it packages proteins received from the ER
D
cytoplasm, because it relies on the ER for structural support
5

Which organism is an animal-like protist?

A
cilia
B
dinoflagellate
C
amoeba
D
truffle
6

Punnett squares are used to show possible combinations of alleles or to predict the probability of a trait occurring in offspring. A pansy that is homozygous for purple flowers (PP) is crossed with a pansy that is homozygous for pink flowers (pp). Which genotypes will be included for the offspring in the Punnett square for this cross?

Question illustration
A
PP, Pp, and pp
B
PP and pp
C
PP and Pp
D
Pp only
7

Suzanne has type A– blood. Which blood type could she receive in a blood transfusion?

A
A+
B
O–
C
O+
D
B–
8

Red-green color blindness is an X-linked recessive disorder that is passed through generations and can be traced by using a pedigree. Which individuals in the pedigree are identified and labeled carriers for red-green color blindness?

Question illustration
A
Lisa and Monica
B
Sam, Tim, Bella, and Joshua
C
Ben, Jenny, Mike, Carol, Katie, and Chris
D
Ben and Lisa
9

What happens when the Sun emits more energy than normal?

A
Solar flares and sunspots occur, increasing Earth’s temperature.
B
Sunspots and volcanic eruptions occur, increasing Earth’s temperature.
C
Volcanic eruptions and movement of continents occur, decreasing Earth’s temperature.
D
Movement of continents and solar flares occurs, decreasing Earth’s temperature.
10

Which statement accurately describes short-term environmental changes?

A
Short-term environmental changes cause changes in genetic makeup.
B
Short-term environmental changes do not happen suddenly with little warning.
C
Short-term environmental changes do not affect organisms within an ecosystem.
D
Short-term environmental changes immediately affect organisms in the environment.
11

A Russian citizen has illegally obtained a Siberian tiger and is trying to sell the tiger’s fur in the United States. What treaty does this violate?

A
Tiger Treaty
B
Lacey Treaty
C
CITES
D
EPA
12

Which statement describes the F1 generation of a Mendelian monohybrid cross between two true-breeding parents?

A
Only the dominant trait is visible in the F1 generation.
B
Only the recessive trait is visible in the F1 generation.
C
Neither the dominant nor recessive trait is visible in the F1 generation.
D
Both the dominant and recessive traits are visible in the F1 generation.
13

What observation led researchers to propose that chloroplasts evolved from cyanobacteria?

A
Both produce proteins.
B
Both contain mitochondria.
C
Both provide structure to cells.
D
Both perform photosynthesis.
14

Which is a component of the modern cell theory that was not part of the original cell theory?

A
All organisms are made of cells.
B
All cells are similar in composition and metabolic activities.
C
All cells come from preexisting cells.
D
A cell is the basic unit of structure and function for all living things.
15

Which scientist disproved the idea that life comes from nonlife?

A
Anton van Leeuwenhoek
B
Louis Pasteur
C
Robert Koch
D
Paul Ehrlich
16

What is one way people have negatively affected land resources?

A
habitat restoration
B
urbanization
C
terrace farming
D
reforestation
17

Unattached earlobes is a dominant trait, E. A parent who is homozygous for unattached earlobes is crossed with a parent who is homozygous for attached earlobes. Which describes the genotypes of their offspring?

A
100 percent Ee
B
100 percent unattached earlobes
C
100 percent ee
D
100 percent attached earlobes
18

Brendan made a chart to categorize the characteristics of animals.

Question illustration
A
Have a backbone
B
Are warm-blooded
C
Are multicellular
D
Eat plants
19

Scientists use specific levels of organization to analyze the biosphere. Which level of organization describes a school of anchovies? School of Anchovies

Question illustration
A
ecosystem
B
community
C
population
D
biome
20

Which option identifies ways that people positively affect Earth’s resources?

A
use cars that emit fewer harmful gases, build dams, and stop using all resources
B
stop using all resources, increase mining efforts, and halt the runoff of factory waste into rivers and streams
C
build dams, use cars that emit fewer harmful gases, and halt the runoff of factory waste into rivers and streams
D
increase mining efforts, build dams, and use cars that emit fewer harmful gases

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