Natural Sciences 3

55 Questions | By Lvnagain | Updated: Dec 26, 2012 | Attempts: 115

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Dec 26, 2012

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Mar 18, 2009

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Natural Sciences 3

Echinoderms include

Following experiments involving the bread mold Neurospora, George Beadle and Edward Tatum:

Which of these pairings of animals and phyla is incorrect?

The oldest recognized bird fossil is that of:

Relaxation of smooth muscles in the wall of arterioles results in ___________ ; contraction of the muscles decreases the diameter of the vessel, which is termed _____________.

About 200 million years ago, the continents had drifted together, forming one large land mass called:

Vertebrates are members of the phylum:

During what type of exercise is an oxygen debt incurred?

One of the oldest bacteria is:

A motor unit consists of:

Self-replicating systems consisting of ____ and enzymes have been successfully assembled in the laboratory as part of investigations into the origin of life.

If a species' DNA contains 23% adenine, what percentage of guanine would it contain?

Active transport:

The small size of cells is best correlated with:

These chemicals are found both in photosynthesis and the electron transport system of mitochondria:

The levels of classification in proper order are, beginning with species:

All of these animals are Old World primates EXCEPT:

The actual process of cell division—where the cell splits into two—is called:

During which phase of the cell cycle is DNA duplicated?

With the exception of certain organisms living near geothermal vents deep in the oceans, all energy in biological systems is ultimately derived from:

A container has two compartments filled with pure water and is separated by a membrane that is permeable to dye molecules and water. If the dye is added to one compartment, dynamic equilibrium will have been achieved when:

The overall function of cellular respiration is to:

Spherical bacteria that occur singly, in chains, or clumps, are called:

The term "anaerobic" means

Each chemical reaction in cellular respiration requires a:

The end of the bronchiole passage in the lungs, a small enclosed space where gas exchange occurs, is known as the:

A recessive allele is never expressed in:

Populations of different species that together inhabit a locality are termed a(n):

How many alleles of one gene may there be in a population of organisms?

The pairing of homologous chromosomes during meiosis is called:

Mendel's first law (of segregation) states that:

The process by which a non-virulent strain of Pneumococcus bacteria is changed to a virulent one, through the influence of DNA from another virulent strain, is called:

Which one of the following plants is NOT a seed-producer?

In this diagram, the glomerulus is indicated by letter:

Within the loop of Henle, at which point is the most concentrated liquid found?

Antidiuretic hormone affects the permeability of the ______________ to water.

The collecting duct is indicated by letter:

The first plants to have airborne pollen were:

The adrenal medulla, when stimulated by the sympathetic nervous system, secretes:

Molting, growth, and the transformation of insects into adult forms are all promoted by:

In plants, the three primary meristems are:

At the stage of animal development near the end of cleavage, the embryo frequently occurs in the form of a hollow ball, called a:

Auxins promote all of these actions EXCEPT:

Endoplasmic reticulum, Golgi, lysosomes, and similar structures in the cell are all part of:

Flowers and pollinators are good examples of:

Carrying capacity is:

All of the following statements are true about T-cells EXCEPT:

All of the following are associated with r-strategists (as opposed to K-strategists) EXCEPT:

The sperm-producing, male structure in bryophytes (and other, non-seed plants) is the:

Which of the following elemental cycles has its principal reservoir in mineral (rock) form and is not present in any form in the atmosphere?

Relaxation of smooth muscles in the wall of arterioles results in _ ; contraction of the muscles decreases the diameter of the vessel, which is termed ___.