Single-celled heterotrophic protists are commonly referred to as:
1.dinoflagellates
2.euglenoids
3.protozoans
4.diatoms
3
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Which of the following is not a step in bacterial nucleotide excision repair (NER)?
A. The UvrA2UvrB complex creates a single-stranded bubble at the damage site to which UvrA subunits are tightly bound and the UvrB subunit dissociates. B. The UvrA2UvrB complex scanned the DNA for damage. C. Pol I fills the gap created by the removal of the damaged strand and the DNA is sealed by ligase. D. UvrC (exinuclease) nicks the damaged strand on one side of the damage randomly. E. UvrD (helicase) unwinds and releases the damaged strand.
The genomes of mammalian mitochondria contain
A. a total of 37 genes. B. genes for proteins used in oxidative phosphorylation. C. genes whose products are used in translation of mRNA. D. ribosomal genes. E. All of the items listed are correct.
If meiosis did NOT occur in sexual
reproducing organisms,
a. growth of the zygote would be halted. b. mitosis would be sufficient. c. gametes would be haploids. d. the chromosome number would double each generation. e. eggs would be haploid, but sperm would be diploid.
Character displacement makes competing species less similar, which facilitates __________. Fill in the blank(s) with the appropriate word(s)