Telomeres are short DNA sequences ____
a. that code for genetic traits
b. that signal transcription to begin
c. located in the middle of a chromosome
d. located at each end of a chromosome
e. repeated along the backbone of a DNA molecule
d
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A scientist is studying some developing eggs from an ocean sample. The early embryos have divided only a few times, and all cells look identical. When the scientist carefully removes half the cells from an embryo, both clumps of cells are able to complete development, forming twins. The eggs can be identified as:
A. deuterostomes B. protostomes C. crustaceans D. cnidarians E. echinoderms Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about determinate and indeterminate development? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
The mechanism of muscle contraction was first studied in ____ muscle using high-resolution ____ microscopy
a. skeletal; light b. smooth; light c. skeletal; electron d. smooth; electron e. cardiac; electron
Which hormone is responsible for the release of follicle stimulating hormone and luteinizing hormone?
a. oxytocin b. estrogen c. gonadotropin-releasing hormone d. testosterone
The cellular organelle responsible for protein synthesis is the
A) nucleus. B) mitochondria. C) centrioles. D) ribosome.