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alexander stevens

alexander s.

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Question 10 1 pts How can the same RNA transcript produce different amino acid sequences? They can't Different RNA polymerases Special tRNA complexes Alternative splicing

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Which plants have xylem? ? vascular ? nonvascular

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1. The DC operating point of the common-emitter amplifier in Figure 1 has been calculated in Question 2 of Tutorial 5 to be $I_C$ = 50 µA and $V_{EC}$ =10.86 V. The pnp transistor $Q_1$ has $\beta$ = 100 and $V_A$ = 75V. Assume that the capacitors have infinite value, what are the voltage gain, input resistance, output resistance and current gain if $V_{CC}$ = $V_{EE}$ = 15 V, $R_t$ = 750 ?, $R_1$ = $R_2$ = 200 k?, $R_L$ = 100 k?, $R_C$ = 100 k?, $R_{E1}$ = 30 k? and $R_{E2}$ = 250 k?. (Ans: $A_v$ = -1.62, $R_{in}$ = 96.86 k?, $R_{out}$ ? 100 k?, $A_i$ = ?1.58). What is the amplitude of the largest ac signal that can appear at the output that satisfies the small-signal limit? (Ans: 505.12 mV)

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According to Kohlberg, each stage in the development of moral reasoning is characterized by a specific focus. What is the correct sequence? a. focus on social rules, focus on consequences, focus on ethical principles b. focus on ethical principles, focus on social rules, focus on consequences c. focus on consequences, focus on ethical principles, focus on social rules d. focus on consequences, focus on social rules, focus on ethical principles QUESTION 59 When infants in a new situation examine their mother's face for cues about what to do, they are demonstrating an ability known as a. all of these options b. imitation c. joint attention d. social referencing QUESTION 60 Scientists generally agree with which statement? a. Differences in test scores between different ethnic groups are due to genetic differences between those groups b. Differences in intelligence between ethnic groups always reflect real, authentic differences in intelligence c. Genes associated with intelligence have been found to be more prevalent among certain ethnicities d. Differences in test scores of different ethnic groups are not due to genetics, but to differences in socioeconomic status, health, and poverty

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Question 1a) In the block diagram shown below, derive a transfer function between D1 and Y. Question 1b) Determine the closed-loop stability conditions for this control system. Question 1c) Determine if the stability conditions hold if Kp = Kc = Kv = Km = 1 and tI = t = tv = 1. Question 1d) If Kp = Kc = Kv = Km = 1 and tI = 1 and t = tv = 0, determine the dynamic response of the output when there is a unit ramp input in D1 and make a comment on the physical realizability of the transfer function. Hint: In all parts of the question, use Pade 1/1 when needed. Gpl D1 Km Gc Gp Ysp Km I = K K Tv * S + 1 Kp * Gp * T * S + 1 GD1 = -Gp

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write_votes(db, filename) Description: It writes the contents of a database1 dictionary back to a CSV file in the same format as it was the original input file Parameters: a database1 and a filename Return value: True for success or False for any kind of error Examples: write_votes(db, 'new_votes.csv') write_votes(db, 'new_votes.csv') True (if db is a databasel dictionary) False (if db is an empty dictionary or another type of variable)

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4. Give at least three examples of types of situations that require microbial growth control, and why. 5. What does it mean to say that most chemicals are disinfectants rather than sterilants 6. Describe Joseph Lister's importance in the history of microbiology. 7. Give the general mode of action of the following: i. Tetracycline ii. Aminoglycosides iii. Polymixin iv. Chlorine v. Glutaraldehyde vi. Alcohol vii. Hydrogen peroxide viii. Phenol 8. Could a mycoplasma infection be treated with penicillin? Explain.

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VDD INVERTER 250 k RL B B A A B = A For the Inverter shown implemented with a discrete BS170 MOSFET, determine the following circuit values. Assume that the voltage drop across the MOSFET when conducting is 1.4 V. The series resistor value from VDD to Drain of the MOSFET is 250 kOhms. (a) With VDD = +5V and the input to the Inverter as VOL what are the following values: The current, I in mA through R$_L$? ____ mA (milli-Amps) The static power dissipated through the MOSFET in mW (Hint: P = IV)? ____ mW (milli-Watts) (b) Now, with VDD = +5V and the input to the Inverter as VIH what are the following values: The current, I in mA through R$_L$? ____ mA (milli-Amps) The static power dissipated through the MOSFET in mW (Hint: P = IV)? ____ mW (milli-Watts)

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A 440-V balanced 3-phase \Delta-connected load having a phase impedance of $22\angle30^\circ \Omega$ is connected in parallel with a 3-phase capacitor bank of 5 kVA. Determine the overall power factor. 0.80 1.00 0.94 0.78

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Pam is convinced that she is no good at sports and refuses to try out for soccer with her friends. Use Mueller and Dweck's (1998) study as a three-step model for how Pam's reinforcement history could have reduced her motivation to participate in sports. Does she have a fixed or flexible view of her sports ability? What could you tell her to encourage her to try out?

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