The ____ has the greatest productivity.
A. tundra
B. desert
C. boreal forest
D. tropical rainforest
D. tropical rainforest
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Someone who has consumed a lot of alcohol becomes dehydrated because alcohol ____
a. inhibits antidiuretic hormone (ADH) secretion, which leads to an increase in urination b. increases antidiuretic hormone (ADH) secretion, which leads to an increase in urination c. inhibits antidiuretic hormone (ADH) secretion, which leads to a reduction in urination d. increases antidiuretic hormone (ADH) secretion, which leads to a reduction in urination e. and water don’t mix, which leads to an exclusion of water
Three loci, mitochondrial malate dehydrogenase that forms a and b (MDHa, MDHb), glucouronidase that forms 1 and 2 (GUS1, GUS2), and a histone gene that forms + and - (H+, H-) are located on chromosome 7 in humans
Assume that the MDH locus is at position 35, GUS at position 45, and H at position 75. A female whose mother was homozygous for MDHa, GUS2, and H+ and whose father was homozygous for MDHb, GUS1, and H- produces a sample of 1000 egg cells. Give the genotypes and expected numbers of the various types of cells she would produce. Assume no chromosomal interference.
The genus Staphylococcus is characterized by all of the following EXCEPT:
A. Catalase positive B. Productions of cytotoxins C. May be a part of the normal bacteria flora D. Staphylococcus aureus is the most virulent strain E. The bacterial cell wall is composed of peptidoglycan, teichoic acid, and LPS
The cytoskeleton of an animal cell changes markedly between G1 and early M phase (prophase) of the cell cycle
For each of the following sentences, choose one of the options enclosed in square brackets that best describes the changes to the cytoskeleton and its components. Before mitosis, the number of centrosomes must [increase/decrease]. At the beginning of [anaphase/prophase] in animal cells, the centrosomes separate in a process driven partly by interactions between the [plus/minus] ends of microtubules arising from the two centrosomes. Centrosome separation initiates the assembly of the bipolar mitotic spindle and is associated with a sudden [increase/decrease] in the dynamic instability of microtubules. In comparison with an interphase microtubule array, a mitotic aster contains a [smaller/larger] number of [longer/shorter] microtubules. Extracts from M-phase cells exhibit [increased/decreased/unchanged] rates of microtubule polymerization and increased frequencies of microtubule [shrinkage/growth]. The changes in microtubule dynamics are largely due to [enhanced/reduced] activity of microtubule-associated proteins and [increased/decreased] activity of catastrophins. The new balance between polymerization and depolymerization of microtubules is necessary for the mitotic spindle to move the [replicated chromosomes/daughter chromosomes] to the metaphase plate.