Scientists attempted for many years to conduct nuclear transplants but failed. However, geneticists had success in cloning a sheep. They were successful because they
A. picked a cell very early in development.
B. replicated the blastomeres before insertion.
C. delayed transcription in the blastomeres.
D. treated the nucleus with sheep plasma before nuclear insertion.
E. utilized a new micro pipette technique.
A. picked a cell very early in development.
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All of the following bones are part of the appendicular skeleton except the ________
a. pelvic girdle b. humerus c. tibia d. vertebral column
Which of the following is the correct sequence that describes the excitation and contraction of a skeletal muscle fiber? 1. Tropomyosin shifts and unblocks the cross-bridge binding sites. 2. Calcium is released and binds to the troponin complex
3. Transverse tubules depolarize the sarcoplasmic reticulum. 4. The thin filaments are ratcheted across the thick filaments by the heads of the myosin molecules using energy from ATP. 5. An action potential in a motor neuron causes the axon to release acetylcholine, which depolarizes the muscle cell membrane. A) 1 ? 2 ? 3 ? 4 ? 5 B) 2 ? 1 ? 3 ? 5 ? 4 C) 2 ? 3 ? 4 ? 1 ? 5 D) 5 ? 3 ? 2 ? 1 ? 4
While neural activity involves transmission of information through electrical events, endocrine activity involves ____
a. transport of hormones to trigger slow, persistent responses b. transport of hormones to trigger fast, transient responses c. release of hormones from exocrine glands for transport outside the body d. changes in neural activity for transport of hormones to target tissues e. transmission of information through chemical reactions
Which of the following is MOST accurate regarding cells?
a. All cells have a nucleus. b. All cells divide by meiosis. c. All living organisms are made up of one or more cells. d. Cells arise through spontaneous generation. e. Growth is solely the result of cell division.