Which of the following statements regarding meiosis is most accurate?
A. Crossing over occurs during metaphase I.
B. A diploid cell produces haploid daughter cells.
C. Haploid cells produce diploid cells.
D. Homologous (non-sister) chromatids separate during anaphase II.
E. Meiosis has the same number of stages as mitosis.
Answer: B
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If Mendel based his data only on two traits, and the genes influencing those traits were linked and located close together on the same chromosome, which of his laws would he not have been able to resolve?
Comments: The law of segregation applies to traits influenced by single genes. The law of Independent Assortment applies to two or more traits that are influenced by genes on different chromosomes (or very far apart on the same chromosome.) A. the law of segregation B. the law of independent assortment
The first step in base excision repair is
A) removal of a double-stranded fragment of damaged DNA. B) nicking the backbone of one DNA strand. C) recognizing and excising the incorrect base from a nucleotide. D) removing extraneous groups such as methyl or oxygen added by mutagens. E) replacing an A-T base pair with a C-G base pair.
Answer the following questions true (T) or false (F)
1. Ciliates often have two kinds of nuclei that have different functions. 2. In fungi, aseptate hyphae are coenocytic by definition. 3. Algae can have different types of photosynthetic pigments that allow them to photosynthesize at various depths in water.
Which of the following taxa are used for classification of viruses as well as organisms?
A) Kingdom B) Class C) Division D) Family E) Division, Class, and Family are used in both taxonomic schemes.