What is the correct sequence for the start of an organism's life cycle?
A) fertilization ? meiosis ? zygote ? embryo
B) meiosis ? fertilization ? zygote ? embryo
C) fertilization ? zygote ? meiosis ? embryo
D) meiosis ? fertilization ? embryo ? zygote
Ans: B) meiosis ? fertilization ? zygote ? embryo
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Which of the following statements about steroid receptors is FALSE?
A. The receptors undergo a conformational change after binding the steroid. B. The receptors are localized to the plasma membrane. C. Once the steroid binds the receptor, the steroid/receptor complexes dimerize. D. Steroid receptors act as transcriptional factors, regulating the expression of certain genes and the subsequent production of proteins. E. Steroid receptors are localized to either the cytoplasm or nucleus.
The first step in the Calvin cycle is the attachment of carbon dioxide to:
a. Rubisco. b. glyceraldehyde 3-phosphate (G3P). c. phosphoglycerate d. RuBP (ribulose bisphosphate). e. ATP.
How many times greater than the calculated background rate is the current rate of extinction estimated to be?
A) 100 B) 50 C) 10 D) 2
The evolutionary origin of the v-src gene is most likely
a) A viral replication gene that mutated and gained cancer-causing properties b) A stretch of non-coding DNA in bird genome where ancient viruses integrated c) A bacterial gene that turned into a viral gene d) A normal bird gene that became part of a viral genome and mutated