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
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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
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 flowNitrogen is a plant macronutrient
Indicate whether the statement is true or false
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