In echinoderms, gastrulation takes place through a primitive groove
____________________ Indicate whether the statement is true or false.
F, blastopore
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One concern of conservation biologists is that endangered species will have low genetic diversity due to a small population size. Why is this a concern?
A. Allele frequencies are lower in smaller populations. B. If the environment changes, individuals will not be able to change their alleles and survive. C. If a disease occurs in the population, there may not be organisms with resistant alleles. D. Individuals in small populations acquire mutations more slowly than those in large populations. E. Sexual selection is stronger in small populations.
The first committed step of Krebs cycle is:
a. acetylCoA synthesis b. oxaloacetate regeneration c. citrate synthesis d. isocitrate dehydrogenation e. pyruvate decarboxylation
Which of these best completes this concept map?
A. an animal cell B. a prokaryotic cell C. a virus D. a plant cell
Cells can be described as having a cytoskeleton of internal structures that contribute to the shape, organization, and movement of the cell. Which of the following are part of the cytoskeleton?
a) microfilaments b) the nuclear envelope c) nucleoli d) mitochondria e) lysosomes