Plants as well as brown, green, and red algae show a basic life cycle which involves the alternation of generations between a(n)
A. spore and pollen.
B. megaspore and a microspore.
C. seed and a cone.
D. sporophyte and a gametophyte.
E. egg and a sperm.
D. sporophyte and a gametophyte.
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The following graph represents the concentration of cyclins over the course of the cell cycle. Which of the following statements is TRUE regarding the phase of the cell cycle where the red arrow is pointing?
A. At this point in the cell cycle, all sister chromatids are fully formed.
B. At this point in the cell cycle, DNA has already been replicated correctly.
C. At this point in the cell cycle, chromosomes have properly aligned on the metaphase plate and are beginning to separate.
D. At this point in the cell cycle, the cell is determining if conditions are favorable for cell division.
E. At this point in the cycle the cell is continuing to grow and make abundant tubulin proteins.
Which of the following is true? The somatic senses
a. use receptors near the body surface, in skeletal muscles, and in joints. b. reside in certain receptor organs located at a few specific locations. c. are exemplified by ears and eyes. d. are most highly developed in fishes and amphibians. e. include all of these descriptions.
In crosses involving complete dominance, the F2 genotypic ratio is 1:2:1 and is expressed as a
phenotypic ratio of ____________________. Fill in the blank(s) with the appropriate word(s).
An enucleated egg cell ________
A) contains an extra copy of a gene B) has two nuclei C) lacks a nucleus D) cannot be used for cloning E) is a type of stem cell