Some green algae exhibit alternation of generations. All land plants exhibit alternation of generations
No charophytes (stoneworts) exhibit alternation of generations. Keeping in mind the recent evidence from molecular systematics, the correct interpretation of these observations is that _____.
A) charophytes are not related to either green algae or land plants
B) plants evolved alternation of generations independently of charophytes
C) alternation of generations cannot be beneficial to charophytes
D) land plants evolved directly from the green algae that perform alternation of generations
E) scientists have no evidence to indicate whether or not land plants evolved from any kind of alga
Answer: B
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You are working in a Drosophila lab, and find a larva with two anterior ends. Both a normal larva and the mutant larva are shown below. What is the most likely explanation for the mutant larva phenotype?
A. There is a mutation in the bicoid gene causing no functional Bicoid protein to be made.
B. The nurse cells that produce the Bicoid protein are defective, so there is no protein at either end of the embryo.
C. There is a mutation in a homeotic gene.
D. There is a high concentration of the Bicoid protein at both ends of the mutant embryo.
E. A protein encoded by a segment polarity gene is not degraded correctly and accumulates in both ends of the embryo.
The solar system formed ____ billion years ago
a. 4 b. 5 c. 6 d. 7 e. 8
What environmental factor can lactation periods be affected by?
a. Temperature of habitat b. Predator numbers c. Amount of other pinnipeds when lactating d. Available nutrients
Provide an overview of the structure of Z-DNA
What will be an ideal response?