Science set 2

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Which of the following is the appropriate threshold value for mammalian neurons ?

-55 mV

In a certain plant , red flowers are dominant over white flowers . A plant heterozygous for red flowers and a plant with white flowers are crossed Which of the following is the expected proportion of phenotypes in the next generation ?

2 red , 2 white

Which of the following is the atomic number that has 12 protons and 12 neotrons

24

If a portion of a strand of DNA bases reads 5 ' AGCTAGCGT 3 ' , what would the sequence of bases on the complementary stand read ?

3 ' TCGATCGCA 5 '

Osteoporosis results from which of the following

A decline in osteoblast activity while osteoblast activity continues at expected levels

Which of the following substances is responsible for donating H + ions to act as a buffer when blood pH rises ?

Carbonic acid

Which of the following is a mass with the ovary that secretes hormones to maintain the uterine lining during pregnancy ?

Corpus luteum

In a phase diagram , which of the following is the term used for a substance held at a temperature and pressure the liquid and gaseous phases of a substance merge together into a single phase ?

Critical point

Which of the following is released by one type of immune cell to directly activate type of immune cell ?

Cytokines

Which of the following is the function of totipotent cell ?

Develops into any kind of cell

The measurement indicated by the line across the centre of the cell is best referred to as which of the following ?

Diameter

Which of the following can lead to a tsunami ?

Earthquakes

Which of the following is the structure through which blood exits the glomerulus ?

Efferent arteriole

separate genomic DNA fragments by size , which of these laboratory methods is most useful ?

Electrophoresis

Which of the following are used to determine a person's DNA sequence ?

Genes

Which of the following statements best supports the hypothesis that viruses can cause cancer ?

Genes that regulate cell division are found in some viruses

Which of the following glands synthesizes antidiuretic hormone ?

Hypothalamus

Which of the following physiological responses is caused by the release of anti diuretic hormones ?

Increase in water reabsorption in the collecting duct

Which of the following reasons explains why it is important for new scientific findings to be published ?

Other scientists can validate or disapprove the findings

Which of the following is the process in which an ovarian follicle matures and releases a reproductive egg ?

Ovulation

Which of the following summarizes a change that takes place as a solid turns into a liquid ?

Particles become less ordered

Which of the following types of cells produce and release antibodies ?

Plasma B cells

Which of the following properties of water explains its solvent abilities for certain substances

Polarity of water molecules

The cytoskeleton of a cell is comprised of which of the following macromolecules ?

Proteins

Which of the following organic molecules contain both an amine and carboxyl group ?

Proteins

Which of the following vessels caries oxygenated blood ?

Pulmonary vein

Which of the following indicates the function of sodium bicarbonate released by the pancreas ?

Sodium bicarbonate neutralizes the acidity of chime

In a phase diagram , which of the following is the term used for a substance held at temperature and pressure where the solid , liquid , and gaseous states of a substance exist simultaneously ?

Triple point

Which of the following microorganisms lack their own metabolic pathways and can reproduce inside a host cell ?

Viruses

In a plant in which fuzzy leaves ( F ) are dominant over smooth leaves ( f ) , which of the following crosses will produce only offspring with smooth leaves ?

ffx ff

Which of the following are specific immune response ( select all that apply ) ?

o T lymphocyte activation and clonal expansion The formation of memory B cells


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