Sexual reproduction in protists involves diverse strategies. Which of the following is common to all types of sexual reproduction in protists?
A. Isogamy
B. Conjugation
C. Heterogamy
D. Anisogamy
E. Syngamy
Answer: E
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The base analog 5-bromouracil can tautomerize. One tautomer behaves like thymine and the other behaves like cytosine. If 5-bromouracil is used as a mutagen, what is the minimum number of times replication must occur to mutate the codon for proline (CCC) into the codon for alanine (GCC)?
A) one generation B) two generations C) three generations D) 5-bromouracil cannot induce this mutation
The eye structure that changes shape in order to focus an image on the retina is the __________.
A) Cone
B) Fovea
C) Lens
D) Retina
Collection of microtubules that assist in the orderly distribution of chromosomes during cell division.
What will be an ideal response?
You are an evolutionary biologist analyzing the evolution of embryo development in different species. You identify an important gene that controls the placement of body regions in fruit flies, mice, and chickens, and you find the gene is exactly the same
in each species. You then determine it is the enhancer sequence of the genes that is different in each species. Why would such very different species have the same gene sequence but a different enhancer sequence? What will be an ideal response?