Biology

uring which period of prenatal development would exposure to teratogens most likely cause defects to major body structures? a. embryo b. implantation c. fetus d. zygote
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The cell responsible for secreting the matrix of bone is the__________a. osteoclast. b. chondroblast. c. chondrocyte. d. osteoblast.
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Which of the following statements concerning transcription is true? A. All types of RNA in the cell are synthesized by transcription, which uses a portion of DNA as a template for copying. B. Promoter sequences signal the end of a gene and mark the place where transcription stops. C. During transcription, entire chromosomes are copied because the starting position of genes is unknown. D. Transcription is the process whereby identical copies of DNA are made in preparation for cell division.
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Choose the best answer. Her repeated pulmonary infections have weakened the right side of her heart, so it is enlarged.a) Since blood is moving between her atria, the blood in her ventricles and arteries is staying where it is, distending those structures. b) Since she has a pulmonary infection, more blood is being diverted to her lungs; this distends her pulmonary trunk and leaves less blood in the systemic circuit.c) Since blood is moving from her systemic circuit into her pulmonary circuit, the pulmonary circuit is distended and the systemic circuit is low on blood.
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Drugs that create feelings of calmness, reduce muscle tension, and lower sympathetic activity in the brain are called _____.
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In the interactive activity, what are the possible phenotypes for fur color and what gene represents each?
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An 1815 volcanic eruption in Indonesia was followed by a three-year faminearound the world. How was the volcano linked to the famine?OA. The eruption's ash and gas significantly dimmed the sun.B. The eruption preserved an ancient human civilization.shOC. The eruption contributed to global warming.OD. The eruption's heat and energy killed all the farmers in its path.OE. The eruption killed many local people.
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In humans, dimples are dominant to no dimples and long eyelashes are dominant to short. A man with no dimples and short eyelashes mates with a woman who is heterozygous for both traits. Determine the phenotypic ratio of the offspring. Also determine what percentage of their offspring will have the same genotype as their mother.
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According to reports by National Public Radio, sales of products labeled Non-GMO have more than doubled over the past two years, jumping from $7 billion to $16 billion. At the same time, organic foods have also been gaining in popularity, though at a much slower rate.What do you know about GMO's?A) All organic foods contain GMO ingredients, as set forth in USDA guidelines.B) 85% of the U.S. corn is GMO; modified to be resistant to herbicides.C)The U.S. does not require that GMO foods be labelled as such.D) Example of GMO: cross-pollinating plants for a desired trait.E) Technology now allows us to transfer genes between organisms of different species and even kingdoms.F) Extensive testing has been conducted on GMO-foods to ensure that there will be no adverse allergic reactions or health risks.
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Which of the following is NOT true regarding organisms in the three domains of life? Group of answer choices: A: Organisms of all domains pass on genetic information. B: Organisms of all domains have a nucleus. C: Organisms in all domains are made up of cells. D: Organisms of all domains have cells walls
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what type of commensal relationship is remora fish and shark ?
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Atrial natriuretic peptide secreted by the heart has exactly the opposite function of ________ secreted by the zona glomerulosa. a. aldosterone b. epinephrine c. calcitonin d. antidiuretic hormone
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How is systemic inflammatory response syndrome (SIRS) different from multiple organ dysfunction syndrome (MODS)?
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An index fossil is:________.a. a fossil found in a particular site. b. the ideal specimen of that species to which all later descriptions must refer. c. the type specimen of a species. d. a fossil used to categorize a stratigraphic layer.
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Stone fly nymphs live in beds of streams that contain a high level of dissolved oxygen (DO). When the dissolved oxygen decreases in the stream, stone fly nymphs can no longer live there. Stone fly nymphs are an example of
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Food couldn't reach the stomach without the blank and the blank
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Why must meiosis and not mitosis be used to produce gametes?
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A shared ancestral character is A) a character that originated in an ancestor of the B) shared by all mammals but not found in the new C) an evolutionary novelty unique to a clade D) an outgroup characters
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True or false. The highlighted bone articulates with the ulna. True or false. The highlighted bone articulates with the ulna. FALSE TRUE
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Some traits do not obey Mendel's law. For example, people with red hair tend to also have pale skin. Why might this be the case?
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what PA projection of the chest may be used to evaluate the heart and great vessels when performing a cardiac series?
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Identify one abiotic factor in the diagram that functions as a limiting factor for the autotrophs in this ecosystem and explain why it would be considered a limiting factor
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While exploring a local wooded area, you encounter what you believe to be a previously uncharacterized organism. Upon microscopic evaluation, you notice a single-celled organism about 1 micrometer, lacking a nucleus. What type of cell is this?a. nucelote b. prokaryote c. not enough information provided d. eukaryote
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What is the name of the process where DNA isduplicated to create two strands of DNA?
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