Biology

Axon terminals of autonomic neurons release either of two neurotransmitters:a. norepinephrine and acetylcholine.b. norepinephrine and aldosterone.c. norepinephrine and dopamine.d. acetylcholine and aldosterone.
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what is the most important factor in how species change over time?
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In the United States about 16% of the population is Rh negative. The allele for Rh negative is recessive to the allele for Rh positive. If the student population of a high school in the U.S. is 3,000, how many students would you expect for each of the three possible genotypes? In certain African countries, 4% of newborn babies have sickle-cell anemia, which is a recessive trait. Out of a random population of 10,000 newborn babies, how many would you expect for each of the three possible genotypes?
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given the codon uca in the first exon of a gene, which change is most likely to result in a nonsense mutation?
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A. Presence of tentaclesB. GVCC. Manubrium
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Place the events related to fertilization in the correct order - Cholesterol covering the sperm membrane breaks down - Second polar body generated - Sperm nucleus enters oocyte - Acrosomal enzymes released
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assume that one counted 67 plaques on a bacterial plate where 1 ml of a 10-5 dilution of phage was added to bacterial culture. what is the initial concentration of the undiluted phage? (pfu
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Which of the following is incorrect regarding how ATP functions as the link between anabolism and catabolism: a. only 40% of the bond energy in the food that we eat is harnessed as ATP. b. the energy released from the conversion of complex molecules (e.g., starch) to simple molecules (e.g., glucose) is used to generate ATP from ADP + Pi. c. the heat released during anabolic reactions is due to the release of energy when simple molecules (e.g., glucose) are combined to form complex molecules (e.g., starch). d. in order to power the human body, energy is created by splitting ATP into ADP + Pi
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TRUE / FALSE. phagocytic cell that accounts for two-thirds of white blood cells
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Sexual reproduction in animals depends on the production of gametes. What process produces gametes in animals?
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the term describes the appearance of a cloudy broth culture.
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Alcohol inhibits antidiuretic hormone (ADH), which results in the production ofa.alarge amounts of dilute urine.b.a small volume of dilute urine.c.a small volume of concentrated urine.d.no urine.
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ferns and mosses are mostly limited to moist environments because
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you have a 5 mg/ml sample of gst (26 kda). what is its concentration in micromolar
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2. Related to population growth, what is the difference between density-dependent and density-independent factors? List at least two different hypotheses as to why the wolf population numbers in Table 1 dropped slightly from 200304 and then seemed to drop significantly from 200711
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gene Xgain-of-functiongene Alikelygene Bgene Yloss-of-functionpreventsunlikelydirectsIf a mutant Drosophila strain has no wings, and a transgene containing wild- type gene A restores wings to the mutant, then likely a_____mutation in_____ exists in the wingless strainIf a mutant Drosophila strain has no eyes, and a transgene containing wild-type gene B does not restore eyes, then gene B is________ to be the mutant gene in the eyeless strain.A mutant mouse strain with big ears has a chromosomal deletion that includes genes X and Y. A transgene containing gene Y restores ears to the mutant strain. The conclusion is that______ is required for normal ear size.Am XX mouse that has an SRY transgene on an autosome will be morphologically male. This result means that SRY______male morphological development.
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Studies of rapidly dividing embryonic animal cells revealed:a cyclic production of certain proteins in sync with the cell cycle.All of these choices are correct.a cyclic activation of protein kinases in sync with the cell cycle.that inhibition of protein production blocks mitosis.that the production of cyclin proteins is followed by activation of CDK enzymes.
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Why would an enlarged prostate gland interfere with urination? A. It inhibits the micturition reflex. B. It inhibits urine production.
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how is it possible that individuals with two different genotypes can have the same phenotype?
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a graduate student analyzes a dna sample at 260 nm periodically over the course of the experiment. each time the sample is measured the absorption decreases. what is happening in the experiment?
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E. coli prefers to use ____ as an energy source, but when this monomer is depleted, the bacterium will ____ for lactose utilization. A) glucose, turn to glycolysis B) fructose, turn to gluconeogenesis C) lactose, turn to the TCA cycle D) amino acids, turn to protein synthesis
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place the correct terms into the sentences about fungal growth. a) Many fungi form a distinctive body called a ___________. b) Individual filaments of cells called ____________ form the fungal body. c) Nuclear division in ____________ fungi produce individual cells separated by septa. d) In ____________ fungi, nuclear division results in a multinucleate condition.
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Hello, can someone please help me with this please? help, please help
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In some individuals, the thyroid does not produce enough hormone, so these individuals may take a replacement hormone, such as thyroxone. The concentration C(t) of thyroxone (in micrograms) in the person's body decays exponentially with a half-life of about seven days. Consider an individual who has taken 120 mcg of thyroxone. a) (1 point) Which of the following is true for the concentration of the drug in the individual's body? After 14 days, none of the hormone remains After 14 days, 30 mcg remains O After 14 days, 119 mcg remains O After 14 days, 106 mcg remains 0.099t > b) (3 points) The thyroxone concentration (in mcg) can be modeled by C(t) 120e where t is the time in days after the individual has taken the drug. When will the concentration be 12 mcg? Round your answer to the nearest day.
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