In the 1950s, several key concepts related to DNA were well understood in the scientific community, such as the polymer structure of DNA, base pairing rules, and the helical structure of the molecule itself. The established methods like X-ray crystallography also contributed to their research.
In the 1950s, when Francis Crick and James Watson were working on their model of DNA, the scientific community had a well-established understanding of several key concepts. For example, it was well accepted that DNA is a polymer of nucleotides, each containing deoxyribose sugar, phosphate group, and one of four nitrogenous bases, A, T, C, and G; and that purines always pair with pyrimidines.
X-ray crystallography was an accepted method for investigating molecular structure. Chargaff's rules, which state that of the four types of nucleotides present in a DNA molecule, two were always present in equal amounts, were also widely accepted. Finally, it was known that the DNA molecule has a helical structure, thanks to the work of Rosalind Franklin.
#SPJ12
If the last cytosine is replaced by a guanine, the last amino acid will become tryptophan instead of cysteine.
UUG AUC CAA UGC.
UUG AUC CAA UGG.
This type of mutation that changes the amino acid is called missense mutation.
In humans, mutations of this type are responsible for diseases such as sickle cell disease. In plants, false sense mutations control, for example, the thickness of the hull of the oil palm fruit.
Answer:
In order to lower the temperature.
Explanation:
Mammals and birds uses evaporative cooling due to their high body temperature because this evaporative cooling removes the high temperature from the body. In this process, the water present in the body absorb all the extra heat and remove this extra heat from the body with change its state from liquid to vapors and the body's temperature cools down. This evaporative cooling is occurs in the process of sweating.
Evaporative cooling is an evolution-driven thermal regulation method that certain organisms utilise to cool their bodies. It mainly occurs in organisms living in hot environments like kangaroos.
Evaporative cooling is a biological process related to evolution and is used as a thermal regulatory method by certain organisms. Evaporative cooling occurs when an organism excretes water from its body surface, which then evaporates, absorbing heat and subsequently leading to cooling. This evolutionary adaptation generally occurs in organisms that live in warm or hot environments where they are exposed to high temperatures. An example of an organism using evaporative cooling is the kangaroo, which licks its forearms, allowing the saliva to evaporate and cool its body during intense heat.
#SPJ3
B.) The growth of spines
C.) The presence of toxins in seed casings
D.) The production of resins
Answer: Option A.
The generation of nectar in flowering cactus is not a nonspecific defensive mechanism.
Explanation:
Cactus is a xerophytes that have adaptations to survive in its environment.
Cactus have extrafloral nectaries that produce nectars for pollination.The generation of Cactus nectars is just to attract insects like bees for polloniation and not as nonspecific defensive mechanism.
The group of cells that have the same functions is called a tissue
to not have a fever response when infected. People thatare
homozygous for the other allele (H), instead, show an
extremeresponse, and body temperature rises high. In heterozygotes
bodytemperate rises to a moderate level. Fitness values of the
threegenotypes are as follows:
LL LH HH
0.9 1 0.8
What will be the gene frequencies of the next generation?
Answer:
LL.=.8
LH= .9
HH= .7
Explanation:
Please see attachment
O the mechanism of death
O the time of death
the manner of death
A forensic autopsy can accurately identify the cause of death, mechanism of death, and manner of death, but it is least likely to accurately identify the time of death.
A forensic autopsy is a thorough examination of a deceased person's body to determine the cause of death, mechanism of death, manner of death, and sometimes the time of death. While a forensic autopsy can accurately identify all of these factors, it is least likely to accurately identify the time of death. Determining the exact time of death can be challenging, as it depends on various factors such as temperature, environmental conditions, and the stage of decomposition.