What is not a method used by ectotherms to affect body temperature?

A. Countercurrent heat exchange
B. Shivering
C. Basking in the sun
D. Increasing metabolic rate
E. Dilation or contraction of blood vessels in skin


Answer: D

Biology & Microbiology

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What type of bonding is likely to occur between two water molecules or strands of DNA?

A. covalent B. ionic C. hydrogen D. both hydrogen and covalent E. both hydrogen and ionic

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The process by which successful traits become more common in subsequent generations is called ____

a. speciation b. mutation c. natural selection d. genetic drift

e. gene flow

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Nitrogen is a plant macronutrient

Indicate whether the statement is true or false

Biology & Microbiology

Which genes are expressed in Drosophila after pattern formation along the A/P axis has been successfully established?

A. homeotic genes B. gap genes C. segment polarity genes D. bicoid genes E. totipotent genes

Biology & Microbiology