Wings of birds and butterflies have similar functions, but different evolutionary origins. They are:
A. physiological structures.
B. homologous structures.
C. phylogenetic structures.
D. analogous structures.
Answer: D
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Metabolic pathways are designed to synthesize necessary cellular reagents as required for cellular and tissue function. To accomplish this, the reaction sequence _______.
a) does not include reactions for which the reverse reaction is significant b) includes both reactions that are essentially irreversible and reactions that are freely reversible (near equilibrium). c) utilized only chemical reactions that are energetically favorable (delta G is negative) under the conditions when synthesis is occurring. d) does not include reactions that are near equilibrium
In a family, both parents have freckles and widow's peak. Both of these traits are dominant: F = freckles, W = widow's peak. They have a child who has no widow's peak and no freckles. Which one is a possible dihybrid genotype of the child?
A) ffww B) FFww C) FfWw D) ffWw
Which of the following is true about eukaryotic replicons?
a. They are activated in linear order across a chromosome. b. They are generally over 2 Mb in length. c. Generally, replicons in heterochromatin replicate last. d. They are all replicated at the same time during S phase. e. They have distinct, conserved termination regions.
Photorespiration is when:
A) plants use sugars by respiration. B) the enzyme rubisco binds CO2 during the Calvin cycle. C) the enzyme rubisco binds O2 during the Calvin cycle. D) plants produce sugars during photosynthesis.