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maks197457 [2]
3 years ago
12

What is one way that early scientists practice differed form modern scientists practice

Biology
1 answer:
ratelena [41]3 years ago
7 0
Early hypothesis was not based on experimentation
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Meselson and Stahl's experiments proved that DNA replicates by which mode?
Irina18 [472]

Answer:

Semi-conservative

Explanation:

Meselson–Stahl experiment proved that DNA replication is a semiconservative process, feeding E. colo bacteria with different types of Nitrogen isotopes (N14 and N15).

Changing the type of radioactive compound in different times of bacteria grow, they could observe that both of the isotopes were present on the bacteria culture.

Basically, if the bacteria present both of them, the DNA was replicated semiconcervely.

Guess what? they show both! (See the image for more information)

6 0
3 years ago
The stem of a plant _____.
alekssr [168]

Answer:

The correct choice is All of the above

Explanation:

A stem is one of two main structural axes of a vascular plant, the other being the root. It supports leaves, flowers and fruits, transports fluids between the roots and the shoots in the xylem and phloem, stores nutrients, and produces new living tissue.

4 0
3 years ago
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What is the climate in Ireland?
lbvjy [14]

Answer:

Explanation:

The climate of Ireland is mild, humid and changeable with abundant rainfall and a lack of temperature extremes. January and February are the coldest months of the year, and mean daily air temperatures fall between 4 and 7 °C (39.2 and 44.6 °F) during these months.

3 0
2 years ago
The process of squeezing food through the digestive tube by contractions of the outer wall is:
Stella [2.4K]
Peristalsis is the process of contractions that move food through the intestines.
3 0
3 years ago
. Statements: (1) Collagen, the most abundant protein in humans, is both a fibrous protein and a glycoprotein. (2) Quaternary st
GuDViN [60]

Answer:

c. Only one of the statements is true

Explanation:

Quaternary structure, the highest level of protein organization in which  association of several protein chains are closely arranged. The protein subunits are attached together by van der Waals forces and hydrogen bonds between nonpolar side chains. it is present in all the proteins which have 80 or more amino acids are present.

Collagen, is most abundant protein in the animal kingdom. It is insoluble fibrous protein present in the extracellular matrix and in connective tissue.

A protein chain has directionality consist of a free amino group at one end, and a free carboxyl group on other end.

Hence, only (2) statement is true the correct option is c.

8 0
3 years ago
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