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Biology

Guest

Which of the following statements is true? DNA testing can only be completed if evidence samples are very large. Polymerase chain reaction (PCR) testing can only be used on "fresh" DNA samples. Only identical twins have the exact same genome. Exclusive DNA testing means the two DNA profiles were an exact match.

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Biology

German Woodard

The bat and human are two very different species. Kevin is trying to explain to his family how similar humans and bats really are. Which statement would NOT be a good argument for common ancestry?

A) they both have hair

B) the forelimbs of both animals have similar anatomy

C) they share similar DNA structures of the hemoglobin protein

D) when comparing their embryos at the 1 week stage, they both have a tail and look strikingly similar

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Biology

Deja Gibbs

A chromosome has an inversion. Which describes a pericentric inversion?

deletion of genes within the same chromosome arm

switching of genes within the same chromosome arm

switching of genes around the centromere

deletion of genes around the centromere

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Biology

Kaley Crosby

Which of the following is the correct definition of a learned behavior ...

A. behaviors that are known innately via genetic information

B. actions that humans know from the time that they are born

C. traits that are innately known and passed between generations

D. an adapted change of behavior due to experience

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Biology

Karina Morrison

Why is the nuclear consider the command center of the cells

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Biology

Princess Barrera

If the plankton contain 100,000 kcal of energy, about how much energy will the manta ray obtain from eating the starfish?

A 10 kcal

B 100 kcal

C 1,000 kcal

D 10,000 kcal

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Biology

Janiah Frank

A population is growing exponentially what can you conclude

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Biology

Davin Cowan

What is described in the following equation? 2H2 (g) + O2 (g) → 2H2O (l) A. helium gas combining with oxygen gas to form water B. hydrogen gas combining with oxygen gas to form water C. hydrogen gas combining with water gas to form hydroxide D. water decomposing to oxygen gas and hydrogen gas

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Biology

Peyton Boyd

During the polymerase chain reaction, the two DNA strands are separated at 95°C, after which the reaction mixture is cooled to 54°C to allow the primers to hybridize to the DNA strands. Why do primer‑template hybrids form instead of parent DNA duplexes?

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Biology

Greyson Mckee

Which of the following describes a benefit of membership in research community?

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Biology

Seth Horn

Two roommates with little botanical knowledge thought they could make a quick profit by growing ferns for the commercial florist market. They thought it would be very easy. All they had to do was collect the thousands of spores produced by a fern on their desktop and plant these like tiny seeds in individual pots. If they placed the pots in the sun, fertilized and watered the spores, and waited about a year, they would have plants that they could sell. Why are they doomed to failure

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Biology

Isaiah Rangel

Some have cell walls with lipopolysaccharide.

a. Archaea

b. Bacteria

c. Both Archaea and Bacteria

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Biology

Leah Estes

Which is NOT a negative consequence of acid rain? A) damages plants and trees B) kills fish and amphibians C) gives soil a better pH for growing crops D) chemical weathering of buildings and concrete

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Biology

Krish Page

Which of the following must exist in a population before natural selection can act upon that population? A. genetic variation among individuals B. variation among individuals caused by environmental factors C. sexual reproduction (random fertilization) D. A and C only E. A, B and C

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Biology

Marina

What do rabbits like to eat?

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