In a scientific experiment, the investigator measures the response of the ________ variable(s)
A. dependent and independent
B. control group
C. dependent
D. standardized
Ans: C. dependent
Explanation: While the experimenter alters the independent variable, the dependent variable is what results and is measured.
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In your garden you decide to plant potatoes. You watch the above-ground development of your plant and decide to categorize the growth into four main stages:
1. The initial development of the stem and leaves (shoot) 2. The development of flowers and general growth of the shoot 3. A vegetative period where not much growth seems to be happening 4. The harvest of your potato crop (digging up the tubers formed near the base of the stem) In stage 2, which is a bigger "sink" for phloem flow? A. development of flowers B. growth of the shoot C. There is insufficient information to answer the question.
Which of the following functions is not directly provided by the human respiratory system?
A. olfaction B. gas exchange between the lungs and the atmosphere C. production of sounds D. transport of oxygen to the cells of the body E. maintaining blood pH homeostasis
(a) Describe by labeled diagram the structural components of the lac operon in E. coli
(b) State the function of the lac regulator gene. (c) State the function of ?-galactosidase in the lac system. (d) Show by diagram the manner in which lactose brings about transcription of the three structural genes of the lac operon. (e) Explain why certain mutations in the regulator gene (I?) of the lac system result in maximal synthesis of ?-galactosidase, permease, and transacetylase even in the absence of the inducer (lactose). What will be an ideal response?
For each of the following sentences, choose one of the options enclosed in square brackets to make a correct statement
An electron bound to a molecule with low affinity for electrons is a [high/low]-energy electron. Transfer of an electron from a molecule with low affinity to one with higher affinity has a [positive/negative] ?G° and is thus [favorable/unfavorable] under standard conditions. If the reduced form of a redox pair is a strong electron donor with a [high/low] affinity for electrons, it is easily oxidized; the oxidized member of such a redox pair is a [weak/strong] electron acceptor.