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skelet666 [1.2K]
3 years ago
13

19.2 Choose the correct answer.

Biology
2 answers:
IgorC [24]3 years ago
8 0

the answer is robert hooke . He discovered the cell in 1665 , by viewing a piece of cork under a microscope and found out small room like blocks , he named these block cells .

Stella [2.4K]3 years ago
7 0
Robert Hooke discovered the cell
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Sort the terms and phrases as to whether they function in or describe primary growth or secondary growth? place each term or phr
Vanyuwa [196]
PRIMARY GROWTH
1) apical meristem
3) elongation
5) increases exposure to light
9) occurs in plants that live only one year

SECONDARY GROWTH
2) cork cambium
4) provides structural support
6) increases vascular flow
<span>7) growth in thickness
</span>10) lateral meristem
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BOTH
8) occurs in plants that live many years.

NEITHER

3 0
3 years ago
Cite particularly the difference in the synthesis of the two biomolecules in animals and plants.
Sonja [21]

Answer:

The preceding section reviewed the major metabolic reactions by which the cell obtains and stores energy in the form of ATP. This metabolic energy is then used to accomplish various tasks, including the synthesis of macromolecules and other cell constituents. Thus, energy derived from the breakdown of organic molecules (catabolism) is used to drive the synthesis of other required components of the cell. Most catabolic pathways involve the oxidation of organic molecules coupled to the generation of both energy (ATP) and reducing power (NADH). In contrast, biosynthetic (anabolic) pathways generally involve the use of both ATP and reducing power (usually in the form of NADPH) for the production of new organic compounds. One major biosynthetic pathway, the synthesis of carbohydrates from CO2 and H2O during the dark reactions of photosynthesis, was discussed in the preceding section. Additional pathways leading to the biosynthesis of major cellular constituents (carbohydrates, lipids, proteins, and nucleic acids) are reviewed in the sections that follow.

Go to:

Carbohydrates

In addition to being obtained directly from food or generated by photosynthesis, glucose can be synthesized from other organic molecules. In animal cells, glucose synthesis (gluconeogenesis) usually starts with lactate (produced by anaerobic glycolysis), amino acids (derived from the breakdown of proteins), or glycerol (produced by the breakdown of lipids). Plants (but not animals) are also able to synthesize glucose from fatty acids—a process that is particularly important during the germination of seeds, when energy stored as fats must be converted to carbohydrates to support growth of the plant. In both animal and plant cells, simple sugars are polymerized and stored as polysaccharides.

Gluconeogenesis involves the conversion of pyruvate to glucose—essentially the reverse of glycolysis. However, as discussed earlier, the glycolytic conversion of glucose to pyruvate is an energy-yielding pathway, generating two molecules each of ATP and NADH. Although some reactions of glycolysis are readily reversible, others will proceed only in the direction of glucose breakdown, because they are associated with a large decrease in free energy. These energetically favorable reactions of glycolysis are bypassed during gluconeogenesis by other reactions (catalyzed by different enzymes) that are coupled to the expenditure of ATP and NADH in order to drive them in the direction of glucose synthesis. Overall, the generation of glucose from two molecules of pyruvate requires four molecules of ATP, two of GTP, and two of NADH. This process is considerably more costly than the simple reversal of glycolysis (which would require two molecules of ATP and two of NADH), illustrating the additional energy required to drive the pathway in the direction of biosynthesis.

4 0
2 years ago
Most cells in the onion root are not undergoing cell division and they have a large purple circle inside them. What are the circ
Oxana [17]
The purple circular structures are the nucleus.
6 0
3 years ago
Scientists believe that the carbon levels in the atmosphere are growing, thus throwing off the stability of the Earth’s atmosphe
professor190 [17]

Answer:

There is overwhelming evidence that human activities, especially burning fossil fuels, are leading to increased levels of carbon dioxide and other greenhouse gases in the atmosphere, which in turn amplify the natural greenhouse effect, causing the temperature of the Earth's atmosphere, ocean, and land surface to

Explanation:

5 0
3 years ago
some organlsms in an ecosystem obtain energy and nutrients from plants these organisms store the energy in the ecosystem when th
Slav-nsk [51]

Answer:

Some of the energy is used by decomposers, and some of the energy is released into the environment as heat.

The producer intakes energy from the sun and 10 % of energy is passed on to tropic level I, and similarly at each tropic level 10% of the energy is passed on and the decomposer are at the last tropic level. Thus they also receive 10% of energy and rest all is released into the energy.

Explanation:

6 0
2 years ago
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