Practice Test 92 - High School Biology

20 questions. Answer them in any order, then submit to see your score and every explanation.

A population of lizards reproduces asexually for many generations, producing offspring that are clones. A new disease appears that kills individuals with a certain genotype. Compared with a sexually reproducing population, why might the asexually reproducing population be at greater risk of being wiped out?
During labor, uterine contractions begin. The contractions trigger signals that make contractions stronger, which then trigger even more strengthening until birth occurs. Which type of feedback is this?
Living in groups can increase competition for food and can spread disease, yet many species still form herds, flocks, schools, or colonies. Which statement best explains why group living is common despite these costs?
A ribosome is moving along an mRNA and building a protein. Which best describes the role of tRNA during this process?
A student draws a simple loop for body temperature control: (1) temperature rises above the set point, (2) sensors detect the rise, (3) responses cool the body, (4) temperature returns closer to the set point, (5) the cooling response decreases. What feature of this loop best shows it is a feedback system that supports homeostasis?
Which statement correctly compares how matter and energy move through ecosystems?
Which option best explains why the same atoms can be found in many different organisms over time (for example, a carbon atom could be in a leaf one year and in a fox later)?
In a forest, fallen leaves build up on the ground. Over time, fungi and bacteria break down the leaves. How does this process affect matter in the ecosystem?
A DNA template strand for a gene segment is: GGCATA. Transcription uses complementary base pairing with RNA nucleotides (A-U, T-A, G-C, C-G) and produces a single-stranded mRNA molecule. What is the correct mRNA sequence?
A small cut damages a blood vessel. Platelets stick to the damaged area and release chemicals that attract more platelets. Newly arriving platelets release more chemicals, which attracts even more platelets. The platelet plug grows quickly until the break in the vessel is sealed. Which choice best explains how the feedback mechanism drives the process to completion?
A student makes two clones from the same plant (so the clones have the same genotype). Clone A is grown with regular fertilizer, and Clone B is grown in the same light and water conditions but without fertilizer. After 8 weeks, Clone A is much taller than Clone B. What is the best conclusion?
Claim: Group living increases survival. Evidence from a controlled comparison in the same habitat: - Survival after 6 months: groups (n = 80 individuals) = 61 survivors; solitary (n = 80 individuals) = 60 survivors. - Average food intake per day was slightly higher in groups. Which choice best evaluates whether the evidence supports the claim?
A biologist tracks three traits in the same lizard population over 40 generations. Trait X frequency: 50%, 49%, 51%, 50%, 50% (Gen 0, 10, 20, 30, 40) Trait Y frequency: 8%, 18%, 33%, 55%, 72% (Gen 0, 10, 20, 30, 40) Trait Z frequency: 30%, 12%, 41%, 19%, 33% (Gen 0, 10, 20, 30, 40) Which trait shows the clearest evidence of directional natural selection?
A student says, "Sister chromatids separate during metaphase." Which correction is accurate?
A population of beetles has two alleles for shell color: $D$ (dark) and $d$ (light). After a new predator arrives, researchers track the frequency of the $D$ allele over time. Year 2000: 0.12 Year 2005: 0.25 Year 2010: 0.46 Year 2015: 0.68 Year 2020: 0.81 Which interpretation best describes the evolutionary trend in this population?
Complete the overall cellular respiration equation by choosing the correct set of products: C6H12O6 + 6O2 → ________
A student claims: "If a rabbit eats 1,000 units of energy worth of grass, then 1,000 units of energy will be available to a fox that eats the rabbit." Which response best corrects the claim using the 10% rule?
In a fish species, striped pattern (R) is dominant over plain pattern (r). Two heterozygous fish are crossed: $Rr \times Rr$ . If the first offspring is plain ( $rr$ ), what is the probability the second offspring will also be plain ( $rr$ )?
In a simple plant–animal relationship, a person exhales carbon dioxide ( $CO_2$ ) and a nearby plant uses $CO_2$ in photosynthesis. Based on the overall equations below, which statement best connects what the person and plant exchange? Photosynthesis: $6CO_2 + 6H_2O + \text{light} \rightarrow C_6H_{12}O_6 + 6O_2$ Respiration: $C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{ATP}$
A DNA template strand for part of a gene is CCATTA. During transcription, RNA nucleotides pair with the template and RNA polymerase joins them into mRNA (U replaces T). What mRNA sequence is produced?

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